In the United States and Canada there are 11 channels available for use
in the 802.11b 2.4GHz WiFi Frequency range. This standard is defined by
the IEEE.
Channel Lower Frequency Center Frequency Upper Frequency
1
2.401
2.412 2.423
2 2.404 2.417 2.428
3 2.411 2.422 2.433
4 2.416 2.427 2.438
5 2.421 2.432 2.443
6 2.426 2.437 2.448
7 2.431 2.442 2.453
8 2.436 2.447 2.458
9 2.441 2.452 2.463
10 2.451 2.457 2.468
11 2.451 2.462 2.473
There are only 3 non-overlapping channels available in the 802.11b
standard.These are Channels 1,6, and 11. For WiFi access points that are
located near each other it is recommended that they each use one of the
above non-overlapping channels to minimize the effects of interference.
http://www.moonblinkwifi.com/2point4freq.cfm
Wi-Fi <http://en.wikipedia.org/wiki/Wi-Fi> consists of unlicensed
channels 1-13 from 2412MHz to 2484MHz in 5MHz steps.
Spectrum assignments and operational limitations are not consistent
worldwide; most of Europe allows for an additional 2 channels beyond
those permitted in the US; Japan has one more on top of that - and some
countries, like Spain, prohibit use of the lower-numbered channels.
Furthermore some countries, such as Italy, used to require a 'general
authorization' for any WiFi used outside an operator's own premises, or
require something akin to an operator registration. For Europe; consult
http://www.ero.dk for an annual report on the additional restrictions
each European country imposes.
http://en.wikipedia.org/wiki/Wi-Fihttp://en.wikipedia.org/wiki/Frequency-hopping_spread_spectrum
--
KI4HXT
EL97af
Robert Davies
AMSAT Area Coordinator
AMSAT Member#35649
AMSAT President's Club
Bronze Sustaining Donor
IFC#2880
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Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
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